reflecting direct light on glossy surface in Cycles
Unfortunately cycles isn't very good at rendering caustics yet, due to the way it traces rays "backwards", from the camera to the light source; it's very unlikely for a ray to bounce off a diffuse surface, a glossy surface, and then hit a point light source.

However there is a working patch which adds Metropolis Light Transport (MLT) and adaptive sampling based on noise detection.

In the mean time, if you don't want to compile blender with the MLT patch, you might want to try Luxrender, an open source render engine which supports unbiased MLT and Bi-directional sampling. It can also use openCL to render using a GPU.